<template>
	<el-container class="home-container">
		<!-- 头部区域 -->
		<el-header>
			<div>
				<img src="../assets/heima.png" alt="">
				<span>电商后台管理系统</span>
			</div>
			<el-button type="info" @click="logout">退出</el-button>
		</el-header>
		<!-- 页面主体区域 -->
		<el-container>
			<!-- 侧边栏 -->
			<el-aside :width="isCollapse ? '64px' : '200px' ">
				<div class="toggle-button" @click="toggleCollapse">
					|||
				</div>
				<!-- 侧边栏菜单 -->
				<!-- unique-opened ":unique-opened='true'"的缩写 是否只保持一个子菜单的展开 -->
				<!-- router同理 在激活导航时以 index 作为 path 进行路由跳转 -->
				<el-menu background-color="#333744" text-color="#fff"
				active-text-color="#409FFF" unique-opened :collapse="isCollapse" 
				:collapse-transition="false" router :default-active="activePath">
					<!-- 一级菜单 -->
					<el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
						<!-- 一级菜单的模板区域 -->
						<template slot="title">
							<i :class="iconsObject[item.id]"></i>
							<span>{{ item.authName }}</span>
						</template>
						<!-- 二级菜单 -->
						<el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" 
						:key="subItem.id" @click="saveNavState('/' + subItem.path)">
							<!-- 二级菜单的模板区域 -->
							<template slot="title">
								<i class="el-icon-menu"></i>
								<span>{{ subItem.authName }}</span>
							</template>
						</el-menu-item>
					</el-submenu>
				</el-menu>
			</el-aside>
			<!-- 右侧内容主体 -->
			<el-main>
				<!-- 路由占位符 -->
				<router-view></router-view>
			</el-main>
		</el-container>
	</el-container>
</template>

<script>
	export default {
		data() {
			return{
				menulist:[],
				iconsObject:{
					125:'iconfont icon-users',
					103:'iconfont icon-tijikongjian',
					101:'iconfont icon-shangpin',
					102:'iconfont icon-danju',
					145:'iconfont icon-baobiao'
				},
				// 是否折叠
				isCollapse:false,
				// 被激活的链接地址
				activePath:''
			}
		},
		created() {
			this.getMenuList()
			this.activePath = sessionStorage.getItem('activePath')
		},
		methods: {
			logout() {
				sessionStorage.clear()
				this.$router.push('/login')
			},
			// 获取所有菜单
			async getMenuList(){
				// 等于res.data
				const { data: res } = await this.$http.get('menus')
				if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
				this.menulist = res.data
				// console.log(res)
			},
			// 点击按钮，折叠与展开菜单
			toggleCollapse(){
				this.isCollapse = !this.isCollapse
			},
			// 保存点击的地址，方便后续点击激活高亮效果
			saveNavState(activePath){
				sessionStorage.setItem('activePath', activePath)
				this.activePath = activePath
			}
		}
	}
</script>

<style Lang="less" scoped>
	.home-container {
		height: 100%;
	}

	.el-header {
		background-color: #373d41;
		display: flex;
		justify-content: space-between;
		padding-left: 0;
		align-items: center;
		color: #fff;
		font-size: 20px;
	}

	.el-header div {
		display: flex;
		align-items: center;
	}

	.el-header div span {
		margin-left: 15px;
	}

	.el-aside {
		background-color: #333744;
	}
	.el-menu{
		border-right: none;
	}
	.el-main {
		background-color: #EAEDF1;
	}
	.iconfont{
		margin-right: 10px;
	}
	.toggle-button{
		color: #fff;
		font-size: 10px;
		line-height: 24px;
		text-align: center;
		letter-spacing: 0.2em;
		background-color: #4A5064;
		cursor: pointer;
	}
</style>
